antelope-ecc/keys/legacy_from_private_key.js

A universal JavaScript ECC digital signature and key utility package for Antelope based blockchains.

import binary_to_base58 from "base58-js/binary_to_base58";
import sha256 from "isomorphic-secp256k1-js/sha256.js";
/**
 * Converts a private key into a legacy antelope/EOS key.
 * @param {Uint8Array} private_key Compressed private key
 * @returns {String} WIF private key.
 */
export default async function legacy_from_private_key(private_key) {
    private_key = new Uint8Array([128, ...private_key]);
    const checksum = await sha256(await sha256(private_key));
    const array = [...private_key, ...checksum.slice(0, 4)];
    return binary_to_base58(new Uint8Array(array));
}